Its hardly revolutionary Eyetech using HiQ's Siamese System did the
same thing with an A1200 and a PC a few years ago now, and this kind
of switching equipment has been around longer than that.
If you want to try this sort of thing for youself you could try VNC
(Virtual Network Computing) all you need is two network cards. There
are Client/Servers for most popular OS's including AmigaOS 68k. You
don't have to rip your systems apart to do it either.